code: def testReadingIterator(self):
      file_path = os.path.join(self._base_dir, "temp_file")
      data = [
          "testing1\n",
          "testing2\n",
          "testing3\n",
          "\n",
          "testing5",
      ]
      with gfile.GFile(file_path, mode="w") as f:
          f.write("".join(data))
      with gfile.GFile(file_path, mode="r") as f:
          actual_data = []
          for line in f:
              actual_data.append(line)
          self.assertSequenceEqual(actual_data, data)
  
imports: import os.path
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import compat, errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 20 for calling the FileIoTest obj's underlying member method code with example usage: obj.testReadingIterator() without return types